$[-/4$ Points$]$

A certain manufacturing company has the following data on quantities shipped and unit costs for each of its four products.

$\backslash$table$[[$Products$,\backslash$table$[[$Base$-$Period$],[$Quantities $($Year $1)]],\backslash$table$[[$Mean Shipping Cost$],[$per Unit $($$$)]]],[$Year $1,$Year $5],[$A$,2,000,10\mathrm{.}50,15\mathrm{.}90],[$B$,5,000,16\mathrm{.}25,31\mathrm{.}00],[$C$,7,000,12\mathrm{.}20,18\mathrm{.}40],[$D$,2,500,20\mathrm{.}00,35\mathrm{.}50]]$

$I_5=$

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Question $17$ of $29$